& btmakemechs()
 
  Syntax: btmakemechs(<faction>,<totaltons>,[<types>,[<opttonnage>,[<maxvariation>]]])
 
  This function returns a space delimited list of mech references.

	Note: This function does NOT create mechs
 
  The function creates a mechsub for the 3025 era for <faction>, 
  weighing <totaltons>. Arguments for <types>, <opttonnage> and 
  <maxvariation> are optional.
 
  Arguments:
  <faction> must be the short name of a faction.
 
  <totaltons> must be a number not less than 20 and not greater than 
  4000.
 
  <types> selects the types of units included in the mechsub:
 
  * If <types> = 1 then the function returns only mechs
  * If <types> = 2 then the function returns only aeros
  * If <types> = 3 then the function returns a mix of both mechs and 
   aeros 
 
  <opttonnage> is the optimum tonnage for units in the mechsub.
 
  <maxvariation> is the maximum variation past <opttonnage>.
 
  Continued in btmakemechs()2